#include <llvm/Config/config.h>
#include "llvm/Support/FileSystem.h"
#include "Unix.h"
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#if HAVE_SIGNAL_H
#include <signal.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_POSIX_SPAWN
#include <spawn.h>
#if !defined(__APPLE__)
extern char **environ;
#else
#include <crt_externs.h> // _NSGetEnviron
#endif
#endif
namespace llvm {
using namespace sys;
Program::Program() : Data_(0) {}
Program::~Program() {}
unsigned Program::GetPid() const {
uint64_t pid = reinterpret_cast<uint64_t>(Data_);
return static_cast<unsigned>(pid);
}
Path
Program::FindProgramByName(const std::string& progName) {
if (progName.length() == 0) return Path();
Path temp;
if (!temp.set(progName)) return Path();
if (progName.find('/') != std::string::npos)
return temp;
const char *PathStr = getenv("PATH");
if (PathStr == 0)
return Path();
size_t PathLen = strlen(PathStr);
while (PathLen) {
const char *Colon = std::find(PathStr, PathStr+PathLen, ':');
Path FilePath;
if (FilePath.set(std::string(PathStr,Colon))) {
FilePath.appendComponent(progName);
if (FilePath.canExecute())
return FilePath; }
PathLen -= Colon-PathStr;
PathStr = Colon;
while (*PathStr == ':') {
PathStr++;
PathLen--;
}
}
return Path();
}
static bool RedirectIO(const Path *Path, int FD, std::string* ErrMsg) {
if (Path == 0) return false;
const char *File;
if (Path->isEmpty())
File = "/dev/null";
else
File = Path->c_str();
int InFD = open(File, FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
if (InFD == -1) {
MakeErrMsg(ErrMsg, "Cannot open file '" + std::string(File) + "' for "
+ (FD == 0 ? "input" : "output"));
return true;
}
if (dup2(InFD, FD) == -1) {
MakeErrMsg(ErrMsg, "Cannot dup2");
close(InFD);
return true;
}
close(InFD); return false;
}
#ifdef HAVE_POSIX_SPAWN
static bool RedirectIO_PS(const Path *Path, int FD, std::string *ErrMsg,
posix_spawn_file_actions_t *FileActions) {
if (Path == 0) return false;
const char *File;
if (Path->isEmpty())
File = "/dev/null";
else
File = Path->c_str();
if (int Err = posix_spawn_file_actions_addopen(FileActions, FD,
File, FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666))
return MakeErrMsg(ErrMsg, "Cannot dup2", Err);
return false;
}
#endif
static void TimeOutHandler(int Sig) {
}
static void SetMemoryLimits (unsigned size)
{
#if HAVE_SYS_RESOURCE_H && HAVE_GETRLIMIT && HAVE_SETRLIMIT
struct rlimit r;
__typeof__ (r.rlim_cur) limit = (__typeof__ (r.rlim_cur)) (size) * 1048576;
getrlimit (RLIMIT_DATA, &r);
r.rlim_cur = limit;
setrlimit (RLIMIT_DATA, &r);
#ifdef RLIMIT_RSS
getrlimit (RLIMIT_RSS, &r);
r.rlim_cur = limit;
setrlimit (RLIMIT_RSS, &r);
#endif
#ifdef RLIMIT_AS // e.g. NetBSD doesn't have it.
getrlimit (RLIMIT_AS, &r);
r.rlim_cur = limit;
setrlimit (RLIMIT_AS, &r);
#endif
#endif
}
bool
Program::Execute(const Path &path, const char **args, const char **envp,
const Path **redirects, unsigned memoryLimit,
std::string *ErrMsg) {
#ifdef HAVE_POSIX_SPAWN
if (memoryLimit == 0) {
posix_spawn_file_actions_t FileActionsStore;
posix_spawn_file_actions_t *FileActions = 0;
if (redirects) {
FileActions = &FileActionsStore;
posix_spawn_file_actions_init(FileActions);
if (RedirectIO_PS(redirects[0], 0, ErrMsg, FileActions) ||
RedirectIO_PS(redirects[1], 1, ErrMsg, FileActions))
return false;
if (redirects[1] == 0 || redirects[2] == 0 ||
*redirects[1] != *redirects[2]) {
if (RedirectIO_PS(redirects[2], 2, ErrMsg, FileActions)) return false;
} else {
if (int Err = posix_spawn_file_actions_adddup2(FileActions, 1, 2))
return !MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout", Err);
}
}
if (!envp)
#if !defined(__APPLE__)
envp = const_cast<const char **>(environ);
#else
envp = const_cast<const char **>(*_NSGetEnviron());
#endif
pid_t PID = 0;
int Err = posix_spawn(&PID, path.c_str(), FileActions, 0,
const_cast<char **>(args), const_cast<char **>(envp));
if (FileActions)
posix_spawn_file_actions_destroy(FileActions);
if (Err)
return !MakeErrMsg(ErrMsg, "posix_spawn failed", Err);
Data_ = reinterpret_cast<void*>(PID);
return true;
}
#endif
int child = fork();
switch (child) {
case -1:
MakeErrMsg(ErrMsg, "Couldn't fork");
return false;
case 0: {
if (redirects) {
if (RedirectIO(redirects[0], 0, ErrMsg)) { return false; }
if (RedirectIO(redirects[1], 1, ErrMsg)) { return false; }
if (redirects[1] && redirects[2] &&
*(redirects[1]) == *(redirects[2])) {
if (-1 == dup2(1,2)) {
MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout");
return false;
}
} else {
if (RedirectIO(redirects[2], 2, ErrMsg)) { return false; }
}
}
if (memoryLimit!=0) {
SetMemoryLimits(memoryLimit);
}
if (envp != 0)
execve(path.c_str(),
const_cast<char **>(args),
const_cast<char **>(envp));
else
execv(path.c_str(),
const_cast<char **>(args));
_exit(errno == ENOENT ? 127 : 126);
}
default:
break;
}
Data_ = reinterpret_cast<void*>(child);
return true;
}
int
Program::Wait(const sys::Path &path,
unsigned secondsToWait,
std::string* ErrMsg,
const char* SignalPrefix)
{
#ifdef HAVE_SYS_WAIT_H
struct sigaction Act, Old;
if (Data_ == 0) {
MakeErrMsg(ErrMsg, "Process not started!");
return -1;
}
if (secondsToWait) {
memset(&Act, 0, sizeof(Act));
Act.sa_handler = TimeOutHandler;
sigemptyset(&Act.sa_mask);
sigaction(SIGALRM, &Act, &Old);
alarm(secondsToWait);
}
int status;
uint64_t pid = reinterpret_cast<uint64_t>(Data_);
pid_t child = static_cast<pid_t>(pid);
while (waitpid(pid, &status, 0) != child)
if (secondsToWait && errno == EINTR) {
kill(child, SIGKILL);
alarm(0);
sigaction(SIGALRM, &Old, 0);
if (wait(&status) != child)
MakeErrMsg(ErrMsg, "Child timed out but wouldn't die");
else
MakeErrMsg(ErrMsg, "Child timed out", 0);
return -1; } else if (errno != EINTR) {
MakeErrMsg(ErrMsg, "Error waiting for child process");
return -1;
}
if (secondsToWait) {
alarm(0);
sigaction(SIGALRM, &Old, 0);
}
int result = 0;
if (WIFEXITED(status)) {
result = WEXITSTATUS(status);
#ifdef HAVE_POSIX_SPAWN
bool Exists;
if (result == 127 && !llvm::sys::fs::exists(path.str(), Exists) && Exists)
result = 126;
#endif
if (result == 127) {
if (ErrMsg)
*ErrMsg = llvm::sys::StrError(ENOENT);
return -1;
}
if (result == 126) {
if (ErrMsg)
*ErrMsg = "Program could not be executed";
return -1;
}
} else if (WIFSIGNALED(status)) {
if (ErrMsg) {
if (SignalPrefix)
*ErrMsg = SignalPrefix;
*ErrMsg += strsignal(WTERMSIG(status));
#ifdef WCOREDUMP
if (WCOREDUMP(status))
*ErrMsg += " (core dumped)";
#endif
}
return -1;
}
return result;
#else
if (ErrMsg)
*ErrMsg = "Program::Wait is not implemented on this platform yet!";
return -1;
#endif
}
bool
Program::Kill(std::string* ErrMsg) {
if (Data_ == 0) {
MakeErrMsg(ErrMsg, "Process not started!");
return true;
}
uint64_t pid64 = reinterpret_cast<uint64_t>(Data_);
pid_t pid = static_cast<pid_t>(pid64);
if (kill(pid, SIGKILL) != 0) {
MakeErrMsg(ErrMsg, "The process couldn't be killed!");
return true;
}
return false;
}
bool Program::ChangeStdinToBinary(){
return false;
}
bool Program::ChangeStdoutToBinary(){
return false;
}
bool Program::ChangeStderrToBinary(){
return false;
}
}